Antenna device

Abstract

An antenna device includes a plurality of antenna elements, a feed circuit which feeds power to the plurality of antenna elements, a conductive chassis which accommodates the plurality of antenna elements and the feed circuit and which is provided with a plurality of opening portions as being opposed respectively to the plurality of antenna elements, and a sheet-shaped cover which covers the plurality of opening portions of the conductive chassis to seal the plurality of opening portions. In addition to covering the plurality of opening portions of the conductive chassis, the sheet-shaped cover may cover the entire conductive chassis. A patch antenna may be utilized as each of the plurality of antenna elements.

1 . An antenna device, comprising:
 a plurality of antenna elements;   a feed circuit which feeds power to the plurality of antenna elements;   a conductive chassis which accommodates the plurality of antenna elements and the feed circuit and which is provided with a plurality of opening portions as being opposed to the plurality of antenna elements respectively; and   a sheet-shaped cover which covers the plurality of opening portions of the conductive chassis to seal the plurality of opening portions.   
     
     
         2 . The antenna device according to  claim 1 ,
 wherein the sheet-shaped cover covers the entire conductive chassis.   
     
     
         3 . The antenna device according to  claim 1 ,
 wherein each of the plurality of antenna elements is a patch antenna.   
     
     
         4 . The antenna device according to  claim 1 ,
 wherein the feed circuit includes at least either a first feed circuit for a first polarized wave or a second feed circuit for a second polarized wave.   
     
     
         5 . The antenna device according to  claim 4 ,
 wherein the first polarized wave is a vertically-polarized wave and the second polarized wave is a horizontally-polarized wave.   
     
     
         6 . The antenna device according to  claim 1 ,
 wherein the feed circuit is formed on a circuit board; and   the plurality of antenna elements are connected to the circuit board via conductive poles.   
     
     
         7 . The antenna device according to  claim 1 ,
 wherein the plurality of antenna elements include a plurality of first antenna elements and a plurality of second antenna elements;   the feed circuit and the plurality of second antenna elements are formed on a circuit board and the plurality of first antenna elements are arranged on the plurality of second antenna elements;   the plurality of first antenna elements are connected to the plurality of second antenna elements via conductive poles; and   the plurality of opening portions are arranged as being opposed to the plurality of first antenna elements respectively.   
     
     
         8 . The antenna device according to  claim 1 ,
 wherein the sheet-shaped cover is a resin tape or a heat-shrinkable tube.   
     
     
         9 . The antenna device according to  claim 1 ,
 wherein material of the sheet-shaped cover is polyvinyl chloride or polyolefin.   
     
     
         10 . The antenna device according to  claim 1 ,
 wherein the conductive chassis is formed of any of a metal plate, conductive plastic plate, and an insulating plate of which surface has a conductive layer thereon.   
     
     
         11 . The antenna device according to  claim 2 ,
 wherein each of the plurality of antenna elements is a patch antenna.   
     
     
         12 . The antenna device according to  claim 2 ,
 wherein the feed circuit includes at least either a first feed circuit for a first polarized wave or a second feed circuit for a second polarized wave.   
     
     
         13 . The antenna device according to  claim 2 ,
 wherein the feed circuit is formed on a circuit board; and   the plurality of antenna elements are connected to the circuit board via conductive poles.   
     
     
         14 . The antenna device according to  claim 2 ,
 wherein the plurality of antenna elements include a plurality of first antenna elements and a plurality of second antenna elements;   the feed circuit and the plurality of second antenna elements are formed on a circuit board and the plurality of first antenna elements are arranged on the plurality of second antenna elements;   the plurality of first antenna elements are connected to the plurality of second antenna elements via conductive poles; and   the plurality of opening portions are arranged as being opposed to the plurality of first antenna elements respectively.   
     
     
         15 . The antenna device according to  claim 2 ,
 wherein the conductive chassis is formed of any of a metal plate, conductive plastic plate, and an insulating plate of which surface has a conductive layer thereon.